个人的笔记
实现验证码的切换
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<div>
验证码
</div>
<div id="a1">
asdadsa
</div>
<script type="text/javascript">
var str = "azxcvbnmsdfghjklqwertyuiopZXCVBNMASDFGHJKLQWERTYUIOP0123456789";
var a=document.getElementById("a1");
var c="";
a.onclick=function shou(){
for(i=0;i<4;i++)
{
b=Math.floor(Math.random()*62);
c=c+str[b];
}
a.innerText=c;
c="";
}
</script>
</body>
</html>